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Strength autoregulation tool
Convert repetitions and RPE into an estimated percentage of your one-rep max using a common RTS-style RPE/RIR reference table. Add an optional 1RM to turn the percentage into a practical working-weight estimate.
RPE conversion
Choose the repetitions performed and the RPE of that set. The optional 1RM field calculates a corresponding working weight in kilograms or pounds.
Method
The converter uses a commonly circulated Reactive Training Systems-style percentage chart that pairs repetition count with RPE. Each chart cell estimates what fraction of 1RM a lifter might use for that set.
Example: 5 reps @ RPE 8 maps to 81.1%. With a 150 kg 1RM, the estimated working weight is 121.65 kg before practical plate rounding.
Reference chart
Percentages are estimates. Use horizontal scrolling on small screens. A personalized chart built from your own training data can be more accurate.
| Reps | RPE 10 | RPE 9.5 | RPE 9 | RPE 8.5 | RPE 8 | RPE 7.5 | RPE 7 | RPE 6.5 | RPE 6 |
|---|---|---|---|---|---|---|---|---|---|
| 1 | 100.0% | 97.8% | 95.5% | 93.9% | 92.2% | 90.7% | 89.2% | 87.8% | 86.3% |
| 2 | 95.5% | 93.9% | 92.2% | 90.7% | 89.2% | 87.8% | 86.3% | 85.0% | 83.7% |
| 3 | 92.2% | 90.7% | 89.2% | 87.8% | 86.3% | 85.0% | 83.7% | 82.4% | 81.1% |
| 4 | 89.2% | 87.8% | 86.3% | 85.0% | 83.7% | 82.4% | 81.1% | 79.9% | 78.6% |
| 5 | 86.3% | 85.0% | 83.7% | 82.4% | 81.1% | 79.9% | 78.6% | 77.4% | 76.2% |
| 6 | 83.7% | 82.4% | 81.1% | 79.9% | 78.6% | 77.4% | 76.2% | 75.1% | 73.9% |
| 7 | 81.1% | 79.9% | 78.6% | 77.4% | 76.2% | 75.1% | 73.9% | 72.3% | 70.7% |
| 8 | 78.6% | 77.4% | 76.2% | 75.1% | 73.9% | 72.3% | 70.7% | 69.4% | 68.0% |
| 9 | 76.2% | 75.1% | 73.9% | 72.3% | 70.7% | 69.4% | 68.0% | 66.7% | 65.3% |
| 10 | 73.9% | 72.3% | 70.7% | 69.4% | 68.0% | 66.7% | 65.3% | 64.0% | 62.6% |
Training guidance
RPE can help a lifter adjust load to current readiness while keeping the training target intact.
Judge RPE immediately after the set based on how many technically acceptable reps you believe remained.
The chart helps translate an RPE prescription into a starting load, but your actual bar speed and technique still matter.
Track weight, reps and RPE over several weeks. Your personal pattern may differ between squat, bench press, deadlift and accessory lifts.
Very easy sets are harder to rate precisely. The reference becomes most useful when effort is high enough to judge reps in reserve meaningfully.
Tool guide
Use these tool-specific notes to understand the method, enter better data, interpret the output, and apply the result appropriately.
The chart links repetitions and session RPE to an approximate percentage of 1RM. It is a programming reference, not a universal physiological law.
RPE is commonly interpreted alongside reps in reserve: roughly RPE 10 means no reps left, RPE 9 about one rep left, and RPE 8 about two, though lifter accuracy varies.
Apply the chart percentage to a credible 1RM or e1RM to get an approximate working load. Round to a load your equipment can actually provide.
Compare predicted and actual performance over time. Experienced lifters often develop more reliable personal RPE relationships than a generic chart can provide.
Frequently asked questions
Practical answers about this tool's inputs, method, results, limitations, and common real-world use.
No. The percentage also depends on reps. For example, 1 rep @ RPE 8 and 5 reps @ RPE 8 correspond to different chart percentages.
The converter can give the percentage without a 1RM. To turn that percentage into a load, supply a known or estimated 1RM.
The reference model is most useful for strength-focused sets. RPE/RIR judgments and percentage relationships generally become less stable as sets become longer and fatigue patterns differ more.
They answer different questions. Use the 1RM calculator to estimate maximum strength from a completed set; use this converter to translate an RPE prescription into relative intensity or a target load.
A common interpretation is about two repetitions in reserve at the end of the set. That is an estimate, and people differ in how accurately they judge remaining reps.
They are related but not identical labels. Strength-training charts often map RPE 10 to 0 RIR, RPE 9 to about 1 RIR, RPE 8 to about 2 RIR, and so on.
Exercise selection, rep range, training age, fatigue, muscle fiber characteristics, technique, and individual endurance all affect the load you can perform at a given perceived effort.
Either can be used if it is current and relevant to the exact exercise. An outdated or poorly estimated max will make every percentage-based load less accurate.
Uncertainty generally increases as reps rise because local muscular endurance contributes more. Use higher-rep chart values as rough guidance rather than precise load prescriptions.
Yes. Sleep, stress, previous training, illness, nutrition, and warm-up can change the load that feels like a given RPE. That day-to-day flexibility is one reason athletes use RPE.
Evidence & model notes
The RPE/RIR concept is widely used in powerlifting and resistance training. Peer-reviewed work describes RPE 10 as 0 RIR, RPE 9 as 1 RIR and so on, while also showing that accuracy depends on training experience and proximity to failure. Reactive Training Systems emphasizes that RPE is an autoregulation tool and that individual lifters may benefit from personalized RPE charts.
Training note: Results are estimates for exercise planning, not medical advice and not a guarantee of performance. Stop lifting if you experience pain, dizziness or other concerning symptoms.